Surpass Hosting doesn't offer custom plans, but if one of the resellers or dedicated resellers might be able to help you out with that. Come to think of it, I believe Cats-Hosting has a plan just like that.
http://cats-hosting.com/shared.php
Check out the 'Kitten' plan. They have a dedicated server with Surpass, my sister has a plan with them and it's been very reliable.
A little history lesson: Surpass used to have a hosting plan of:
1gb space
15gb bandwidth
etc... but no add-on domains, but they cancelled it for some reason or another.